Also called alnico magnetic, horn is the first to use magnets, such as the trumpet loudspeaker (50 s and 60 s
Everybody called loudspeakers)
Generally made from magnetic type horn (
Magnetic type is also available)
Smaller power, frequency range is relatively narrow, is hard but brittle, processing is not very convenient, need grinding or edm.
Iron oxide magnetic by magnetic material powder and iron powder material in about 1200 ℃ sintering.
General made magnetic type horn, advantages: cheap, sexual price is high.
Disadvantages: large size, smaller power, narrow frequency range.
Performance is far better than that of iron oxide magnetic ndfeb magnet, the magnet on the horn at present USES at most.
In the same volume magnetic intensity is generally iron oxide magnetic intensity more than 10 times.
Its characteristic: the equivalent magnetic flux under its small volume, big power, wide frequency range and the HiFi headphones basically with the magnets.
Disadvantages: as the government strictly control the dosage of rare earth, prices soared.
Second, the magnet on the horn,
The influence of sound quality (
Refers to the magnet compared to volume, homophones cases)
Better magnet material, magnetic flux density B is, the greater the effect on the sound film of thrust is stronger also.
Magnetic flux density B (
Magnetic induction intensity)
: in the magnetic field perpendicular to the direction of the magnetic field, magnetic field force of F with current intensity I and the ratio of the product of the wire length L IL, formula for = F/B (
The magnetic flux density B, the greater the power is, the bigger the SPL (sound pressure level
The higher the relative also.
Headphones: sensitivity to headphones enter 1 mw, 1 KHZ sine wave, the headset can emit sound pressure level (
Sound pressure unit is the dB, the greater the pressure the greater the volume)
The smaller, so generally the higher the sensitivity, the impedance, headphones, the more likely it is to make a sound.
The magnetic flux density B, the greater the horn total quality factor Q value is relatively low.
Refers to the damping coefficient of the horn,
A set of parameters.
In the TS parameters, Q value into the Qms, Qes and for Qts signs, Qms damping for the mechanical system, manifests the horn and absorption of energy consumption in the movement of parts.
Qes for power system damping, mainly reflected in the voice coil dc resistance of power consumption;
For Qts signs for total damping, associated with the above two is for Qts signs = Qms * Qes/(
The greater the magnetic flux density B, transient, the better.
Transient can be understood as the signal 'reaction speed, Qms is quite high.
Transient response good headphones should signal would respond immediately, a stop signal to a screeching halt.
Especially the drumming and larger scene symphony band is the most obvious to the transition part of the ensemble.
Three, summarized the quality of the magnet is one of the important factors affecting quality stand or fall, close, when the choose and buy headphones should according to their own needs to choose the most suitable for his own product.